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POBest way to handle a chain of animations with UIViewAnimations
 

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  1. POBest way to handle a chain of animations with UIViewAnimations
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    <p>I am build an iOS application in which I have a requirement for the backgroundColor of the view to animation through a selection of colors. In my viewDidLoad method I am basically firing off a chain of UIView animations using the following.</p> <pre><code>-(void) beginFirstStageBackgroundAnimation { [UIView animateWithDuration: 3.0f delay: 3.0f options: UIViewAnimationOptionTransitionCrossDissolve animations:^{ self.view.backgroundColor = [UIColor colorWithRed: 251./255 green:203./255 blue:147./255 alpha:1.0]; } completion:^(BOOL finished){ [self secondStageBackgroundAnimation]; } ]; } </code></pre> <p>The completion handler fires the second method containing the next color....</p> <pre><code>-(void) secondStageBackgroundAnimation { [UIView animateWithDuration: 3.0f delay: 3.0f options: UIViewAnimationOptionTransitionCrossDissolve animations:^{ self.view.backgroundColor = [UIColor colorWithRed:251./255 green:224./255 blue:96./255 alpha:1.0]; } completion:^(BOOL finished){ [self thirdStageBackgroundAnimation]; } ]; } </code></pre> <p>And so on...this goes on until in the seventh animation I call <code>[self beginFirstStageBackgroundAnimation];</code> in the completion to begin the process again.</p> <p>When the I leave the view with the back button, in viewDidDisappear or when the timer on the display ends I run <code>[self.view.layer removeAllAnimations];</code> to entirely get rid of the animations. However, the app runs and works exactly as intended but seems to be crashing after leaving the view and running for a whole and although I don't know why yet it seems related to this animation chain.</p> <p>Is there a better solution to animate the backgroundColor of the view every 3 seconds with a 3 second delay? </p> <p>And does <code>[self.view.layer removeAllAnimations];</code> actually do what I want?</p> <p>EDIT: The code where I leave the view is as follows:</p> <pre><code>-(void) backBtnPressed:(id)sender { [self stopAudio]; // stop audio that is playing. [self.view.layer removeAllAnimations]; // remove all animations? [self.navigationController popViewControllerAnimated: YES]; // pop view from stack } </code></pre>
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    1. USPaul Morris
    1. USPaul Morris
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    1. COi'm not sure that removeAllAnimations stops your animation, it's for animation attached to layer, and you are not directly using layer animation, but UIView animation... anyway it should not crash, you could call it even without calling any animation at all. what's your log after a crash?
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      1. POBest way to handle a chain of animations with UIViewAnimations
      1. USmeronix
    2. CO+1 the real danger here is winding up the stack in a loop every three seconds - basically a big slow recursion. the answer you accepted avoids that, as does my own. i'm sure the accepted answer is fine, though it's my preference to stick with blocks wherever possible.
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      1. USdanh
 

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